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Updated: June 25, 2025
He says: "After the heart had ceased pulsating an undulation or palpitation remained in the blood itself which was contained in the right auricle, this being observed so long as it was imbued with heat and spirit." He recognized too the importance of the auricles as the first to move and the last to die.
Heart of a human embryo, eight weeks old, back view. a apostrophe left auricle, a double apostrophe right auricle, v apostrophe left ventricle, v double apostrophe right ventricle, cd apostrophe right superior vena cava, ci inferior vena cava.
The thicker and denser side lies toward the left of the animal’s body and is called the left side of the heart; the other is the right side. Locate the right auricle and the right ventricle; the left auricle and the left ventricle. Lay the heart on the table with the front side up and the apex pointing from the operator.
On account of its hypertrophy, the left auricle is able to send an increased amount of blood into the left ventricle, which in turn becomes hypertrophied and sends enough blood into the aorta to satisfy the requirements of the systemic circulation in spite of the leakage through the mitral valve. As long as this compensation continues, there are no symptoms.
It is in like manner evident that the auricles pulsate, contract, as I have said before, and throw the blood into the ventricles; so that wherever there is a ventricle, an auricle is necessary, not merely that it may serve, according to the general belief, as a source and magazine for the blood: for what were the use of its pulsations had it only to contain?
These are known as the chordæ tendineæ, or heart tendons. Their purpose is to serve as valve stops, to prevent the valve from being thrown, by the force of the blood stream, back into the auricle. The mitral, or bicuspid, valve is suspended around the opening between the left auricle and the left ventricle, with the free margins extending into the ventricle.
There was a circular lacerated opening in the tricuspid valve, and the ball must have been in the right auricle during the fourteen days in which the man lived.
It has now been known for some time that the primary stimulus of cardiac contraction generally occurs at the upper part of the right auricle, near its junction with the superior vena cava, and that this region may be the "timer" of the heart. This is called the sinus node, or the sino-auricular node, and consists of a small bundle of fibers resembling muscle tissue.
Till about this time a straight artery has been observed to beat with the regularity of the pulse; but now it appears doubled somewhat into the shape of an adult heart, although as yet it has but one auricle and one ventricle. As time advances we find the perfect heart with its two ventricles and two auricles, all developed from the original straight artery.
This is the most frequent form of valvular disease of the heart, and is due to a shortening or thickening of the valves, or to some adhesion which does not permit the valve, to close properly, and the blood consequently regurgitates from the left ventricle into the left auricle during the contraction of the ventricle.
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